PMW-PNN-PT陶瓷的制备及介电性能研究  

Preparation and Dielectric Properties of PMW-PNN-PT Ceramics

作　　者：高秀华[1] 崔斌[1] 史启祯[1] 

机构地区：[1]西北大学化学系/陕西省物理无机化学重点实验室,西安710069

出　　处：《无机化学学报》2006年第9期1685-1689,共5页Chinese Journal of Inorganic Chemistry

基　　金：西安市科技攻关计划项目(No.GG05068)资助。

摘　　要：0.29Pb(Mg1/2W1/2)O3-0.41Pb(Ni1/3Nb2/3)O3-0.30PbTiO3 + 0.002 5MnO2 + xWO3(PMW-PNN-PT) ceramics were prepared by Semichemical Method. The Mg(Ac)2, Ni(Ac)2, and Mn(NO)3 solution rather than MgO, NiO and MnO2 were added to the slurry of PbO, WO3, Nb2O5 and TiO2 and then calcined at 850 °C for 2 h. Then the sample was sintered at 1 100～1 200 °C for 2 h. The effect of sintering temperature and WO3-excess amounts on the phase constitute, microstructure and the dielectric characteristics was investigated. The result showed that the PMW-PNN-PT powders with pure pervoskite phase were prepared by single-step calcination. The development of sintered temperature contributes to the increase of dielectric constant and the flatness of dielectric temperature dependence. But the dielectric properties will be worse if the sintered temperature is too high. The increase of WO3-excess level lead to an increase of Pb2WO5 phase and the flatness of dielectric curves, but the dielectric constant will be decreased. The proper WO3-excess amount of X7R type PMW-PNN-PT ceramics is 5mol% and the proper sintering condition is 1 150 °C for 2 h, the maximum dielectric constant is 5 395.0.29Pb（Mg1/2W1/2）O3-0.41Pb（Ni1/3Nb2/3）O3-0.3OPbTiO3 ＋ 0.002 5MnO2 ＋xWO3（PMW-PNN-PT） ceramics were prepared by Semichemical Method. The Mg（Ac）2, Ni（Ac）2, and Mn（NO）3 solution rather than MgO, NiO and MnO2 were added to the slurry of PbO, WO3, Nb2O5 and TiO2 and then calcined at 850℃ for 2 h. Then the sample was sintered at 1 100-1 200 ℃ for 2 h. The effect of sintering temperature and WO3-excess amounts on the phase constitute, microstructure and the dielectric characteristics was investigated. The result showed that the PMW-PNN-PT powders with pure pervoskite phase were prepared by single-step calcination. The development of sintered temperature contributes to the increase of dielectric constant and the flatness of dielectric temperature dependence. But the dielectric properties will be worse if the sintered temperature is too high. The increase of WO3-excess level lead to an increase of Pb2WO5 phase and the flatness of dielectric curves, but the dielectric constant will be decreased. The proper WO3-excess amount of X7R type PMW-PNN-PT ceramics is 5mo1% and the proper sintering condition is 1 150 ℃ for 2 h, the maximum dielectric constant is 5 395.

关 键 词：半化学法 X7R型 介电常数 “壳-芯”结构 

分 类 号：O742[理学—晶体学] TQ174[化学工程—陶瓷工业]